chore(deps): bump proc-macro2 from 1.0.39 to 1.0.40 (#1393)

Bumps [proc-macro2](https://github.com/dtolnay/proc-macro2) from 1.0.39 to 1.0.40.
- [Release notes](https://github.com/dtolnay/proc-macro2/releases)
- [Commits](https://github.com/dtolnay/proc-macro2/compare/1.0.39...1.0.40)

---
updated-dependencies:
- dependency-name: proc-macro2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Cargo.lock

@@ -2782,9 +2782,9 @@ checksum = "dbf0c48bc1d91375ae5c3cd81e3722dff1abcf81a30960240640d223f59fe0e5"
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.39"
+version = "1.0.40"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c54b25569025b7fc9651de43004ae593a75ad88543b17178aa5e1b9c4f15f56f"
+checksum = "dd96a1e8ed2596c337f8eae5f24924ec83f5ad5ab21ea8e455d3566c69fbcaf7"
 dependencies = [
  "unicode-ident",
 ]

ethers-core/Cargo.toml

@@ -39,7 +39,7 @@ cargo_metadata = { version = "0.14.2", optional = true }
 # eip712 feature enabled dependencies
 convert_case = { version = "0.5.0", optional = true }
 syn = { version = "1.0.96", optional = true }
-proc-macro2 = { version = "1.0.39", optional = true }
+proc-macro2 = { version = "1.0.40", optional = true }
 rust_decimal = "1.25.0"
 
 [dev-dependencies]